Do I need to do anything special to trade on PlayerAuctions?

To trade on PlayerAuctions, you will need to set your Steam
inventory to public. To do that, go on Steam, click on your
username in the top bar, click on "Edit my Profile" on the right,
and then on "My Privacy Settings". There, make sure that your
inventory is set to "Public".

Your account will also need to have the Steam Guard Mobile
Authenticator activated for more than 7 days. If it's not the
case, every trade you make will be put on a 15-day hold by Steam.
PlayerAuctions will not be responsible if you have to wait a few
days to get your item. Make sure to set up the Mobile
Authenticator beforehand!